technicolor tg589vn v3 in bridge. fastweb.

[abfifa]

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PER CONNESSIONE VDSL e IP_WAN VDSL:

dhcp client ifdetach intf=IP_WAN
ip ifdetach intf=IP_WAN
eth ifdetach intf=ETH_WAN
eth bridge config vlan=enabled filter=none
eth vlan add name=ponte vid=10
eth ifconfig intf=ETH_WAN dest=bridge vlan=ponte
eth ifattach intf=ETH_WAN
eth bridge ifdetach intf=BR_VDSL2
eth bridge ifdelete intf=BR_VDSL2
eth bridge ifadd intf=vdsl
eth bridge ifconfig intf=vdsl dest=efmif1
eth bridge ifattach intf=vdsl
eth bridge vlan ifadd intf=vdsl name=ponte
eth bridge vlan ifdelete intf=vdsl name=default
>>>Warning: default VLAN changed for bridge interface to VLAN ponte.
eth bridge vlan ifadd intf=ethport4 name=ponte
eth bridge vlan ifdelete intf=ethport4 name=default
>>>Warning: default VLAN changed for bridge interface to VLAN ponte.
ip ifattach intf=IP_WAN
saveall

questo è il mio caso, solo che alla seconda opzione cioè ip ifdetach intf=IP_WAN ho soltanto "loop o LocalNetwork" come scelte. e se scelgo la seconda mi si pianta il router, e devo riavviarlo.
come risolvo?